Drain valve



F. KNIGHT.

} DRAIN VALVE. I APPLICATION FILED 050.15. 1919.

1,420,559. w Patented June 20, 1922. h

3 SHEETS-SHEET! I.

1 mmnnll nuw- F1 1 mag/ 271375 F. KNIGHT. mm VALVE. APPLICATION FILED DEFLIE, I919.

1 ,42O, 55 9 Pateni aed June 20, 1922.

3 SHEETS-SHEET 2- my V F. KNIGHT- DRAIN VALVE. APPLICATION FILED 05c. 1'5, 1919; f 1',420,559, Patented June 20, 1922.

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- .BY I

' omrsn [sures- PATENT .ome

GILBERT COLVILLE, orlvrorroniii, c NApA. j

mama VALVE.

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Application mea-mecemb To all whomoit may concern: Be ltlknown thatv I, F E ERIC K IGH a subject ofthe Kingof GreatBritain, and

resident of Victoria, in ,thej Province of British Columbia, Dominion, of Canada,

. have invented certain new and useful Im- ,provements '1n Dra1n Valves,of which the following is a specification.

This invention relates to improvements in drain valves for .useon steam pipes, pipe 7 lines, steam cylinders, etci, wherein ,drainage of. excess "steam and-condensed water is necessary, and the objects of the; invention are to provide. a drainvvalve which is automatically closed byjsteam pressure,; and is automatically opened-when released from steam pressure. 7

Further ObJGCtS are to minimize the number of working members, and toimount the ,a drain valve which can'beemployed to cylinders, and to simplify the construction ,and renderthe drain valve lnexpenslve, and

working elements in'the valve, so that they will be bodily removable ---when disassembling the valve, thereby providing for ready inspection or repair of the 1 working parts.

It further has for its objects to provide simultaneously drain one or more pipes and durable, and easy and effective in operation, and to permit of the valvewhen disassembled being readily reseated in its cooperating part of the casing, so that a reliable valve will at all times .be obtained.

Vith the above and other objects-.in view, the invention consists essentially of the improved construction, hereinafter described in detail in the following specification and accompanying drawings.

In the drawings Figure 1 is a side elevation of the improved drain valve.

Figure 2- is a vertical section through the valve casing showing part of the valve in section.

Figure 3 is a top plan of the improved drain valve.

Figure 4C is a plan view of the upper portion of the valve casing as seen when looking upwardly.

Figure 5 is a vertical section of the upper portion of the valve casing.

Figure 6 is a side elevation of the upper portion of the valve casing.

Figure 7 is a vertical section through the tion of the 3 valve, casing showing the valve Specification of: L nd -P te Patented J line 20, 192% 5, 4 319. Serial; 11053441172.

-gglthe valveseat.

lower portionofthe valve casing and-show Figure S is; a; plan view of the, lower por- S att 3 Referring to the drawings, A, represents the valve casing formed in two portions; 10;

and, '11, the upper portion l 10;,having. l t ally; extending conduits 12 arranged, in alignrnent and threaded internally for; the

reception of. :drain pipes.

yided with acylindri cal chamber, 13 which s normally closed by, the under portion 11 of v the casing, thesaid chamber-513 communieating with,;the conduits 12. through;;,L-

The upper portion lOoftthelcasing-is pro-i planlof t e.am l r ideot.

1 ,po Figure 9.1is aplani view of the underside in the sideswall lo of thechamber l3, w,hile

the completionof the lower armsoftheL shaped ports is formedin the lower porltion yll of the casing.

The lateral Wan smile samba 1311s threaded internally as shown v 1,6,",and the lower portion 11. .of,t he casing' isl rforined with ,a threaded npper end,l7 adapted to .to the, ,portion;-l0,l. a n. annular ,flangeflSiis provi ded, which abuts of the casing. V i p I V I The lowerportion is formed with a hexagonal or like nut 19, which facilitates tightening it into threaded engagement with the upper portion 10, and a central conduit 20 is provided in the lower portion.

This central conduit 20 is provided with an enlarged lower threaded .end 21, which may be connectedto awaste pipe, and an upper enlarged end 22, which houses a spring 23 coiled around the stem 24 of the valve 25. This spring engages at the lowerend with the shoulder 26, and on the upper the upper portion 10 end with the annular recess 27 formed in shaped ports 14, "part a of which-r are; formed 3o conical wall of the valve 25 coacts, and a cylindrical projection 29 is provided on the upper wall of the valve 25 and formed with a saw draught to facilitate grinding the valve into the valve seat.

It will be particularly noticed by reference to the drawings, that the diameter of the valve 25 makes a good sliding fit in the cylindrical chamber 13, but this chamber is provided on its lateral Walls with by-passes 30, and the upper wall of the chamber is formed with a threaded conduitv 33 for connection with a steam pipe leading;

to the valve chamber of a cylinder.

The upward movement or the valve 25 is limited by downwardly extending projections 34 formed on the upper wall of the chamber 13.

The valve 25 reciprocates in the chamber 13, and when in use, the conduits 12 are connected to drain pipes. The conduit 33 is designed to be connected to a steam pipe leading to the valve chamber of a cylinder.

WVhen the valve is in operation, the steam pressure from the valve chest of the engine acting on the upper face of the valve 25 will cause the said valve to be closed on its coacting valve seat 28, so that the L-shaped 'ports 14 will, be covered by the valve 25.

As soon as the pressure has been released, the springs 23 will move the valve 25 upwardly until the upper face of the valve engages with the projections 34 on the upper wall of the cylindrical chamber 13, and any excess steam or water will then pass through the passageways 1a in the wall of the cylin drical chamber 13, and be delivered to the conduit 20, and so pass to waste.

The conduits 12 which have been connected to drain pipes will allow the waterflowing from the said conduit to pass through the conduits 12, L-shaped ports 142 into the lower part of the cylindrical chamber 13, and-thence through the conduit 20 to waste.

T 0 allow the water to pass through the conduit 20 to waste, it should be noted that the stem 24 of the valve 25 is Y-shaped in cross section, so that when the valve is displaced from its seat there is adequate clearance' between the stem and conduit 20.

The action 01 this valve is automatic, and the valve will be closed as soon as the steam pressure is brought to bear on the'same, and it will be opened under the action of the spring 23 after the steam pressure has been removed. a

As many changes could be made in the above construction, and many apparently widely different embodiments of my invention, within the scope of the claim, constructed without departingjironi the spirit 7 or scope thereof, it is intended that 'all'mat conduits through L-shaped ports, part 01" the said ports are formed in the side wall of the said chamber, while the completion of the lower arms of the L-shaped port is formed in the lower portion of the casing, and extends into the conical valve seat between the top and bottom thereof, a valve on the conical valve seat having a sliding fit with the aforesaid chamber, the said chamber being prpvided with suitable by-passes around the Va ve.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

FREDERICK KNIGHT.

WVitnesses:

HAROLD GRInwooD, RAY MARCHARD. 

